If the heater core (2 heater core tubes at firewall) is hot and the interior is cold, then the blend door is causing your problem. It is controlled by electrical and vacuum components.
Also, note that the heater core tubes have a valve that is replaced with the entire hose.
Also, the heater core, if plugged can be replaced as follows:
Heater Core
REMOVAL & INSTALLATION
To install:
INTERIOR
Instrument Panel and Pad
REMOVAL & INSTALLATION
If equipped, disable the SIR system, as outlined in Section 6 of this manual.
If not done already, disconnect the negative battery cable.
Unfasten the defroster grille retaining screw, then remove the grille.
To remove the instrument panel end-caps, for Cavalier, use a suitable prytool. Position the tool behind the cover and carefully pry outward. For the Sunfire, unfasten the end-cap retaining screws and remove the cap.
Fig. 1: Air distribution duct mounting - Cavalier shown
Fig. 2: Location of the air distribution duct mounting - Sunfire shown
Fig. 3: Detach the instrument panel lamp connector
For the Cavalier, remove the instrument panel trim pad.
Remove the instrument cluster trim plate.
As outlined in Section 6 of this manual, remove the heater and A/C control panel.
Remove the radio assembly, as outlined in Section 6 of this manual.
Unfasten the air distribution ducts.
Fig. 4: Instrument panel-to-tie bar attachments - Cavalier shown
Fig. 5: Instrument panel-to-tie bar mounting - Sunfire shown
Detach the instrument panel compartment lamp electrical connector.
Unfasten the screws to the tie bar, then remove the instrument panel from the tie bar.
To install: Position the instrument panel to the tie bar, then secure with the retaining screws.
Attach the instrument panel compartment lamp connector.
Fasten the air distribution ducts.
Install the radio and the heater and A/C control.
Install the instrument cluster trim plate.
For the Cavalier, install the instrument panel trim pad.
Install the end caps.
Position the defroster grille, then secure with the retaining screw,
Enable the SIR system, if equipped. For details, please refer to the procedure located in Section 6 of this manual.
Connect the negative battery cable.
Click on X's for diagrams
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